Motor operated surfacing tool



INVENToR.

March l, 1955 R. R. PULLEN MOTOR OPERATED SURFACING Toor.

Filed March 5, 1954V O ooooooooo o United States Patent O MOTOR OPERATED SURFACING TOOL Raymond R. Pullen, Rumson, N. J.

Application March 5, 1954, Serial No. 414,302

Claims. (Cl. 144-115) rllhis invention relates to a motor operated surfacing too lt is an object of the present invention to provide a scraping disc adapted to smooth rough woods, remove paint or varnish therefrom and to smooth soft metals such as lead or aluminum.

It is another object of the present invention to provide a scraping disc of the above type which is air cooled and which is selfsharpening in operation.

Other objects of the present invention are to provide a scraping disc bearing the above objects in mind which is of simple construction, inexpensive to manufacture, has a minimum number of parts, is easy to use, and efficient in operation.

For other objects and a better understanding of the invention, reference may be had to the following detailed description taken in connection with the accompanying drawing, in which:

Figure 1 is a rear elevational view of the device;

Fig. 2 is a vertical sectional view taken along the line 2-2 of Fig. l; and

Fig. 3 is an enlarged vertical sectional view taken along the line 3-3 of Fig. 1.

Referring now more in detail to the drawing, a sheet metal disc is provided with a central opening through which passes a bolt 11 for a purpose which will hereinafter become clear, with the bolt head adjacent the front face of the disc. A plate 12 is provided on the bolt 11 intermediate the head thereof and the front face of the disc 10. The disc 10 at its center is provided with the intersecting slits 13 and 14 which pass through a central opening therein receivng the bolt 11, each of the slits 13 and 14 at opposite ends being provided with the openings 15. On the scraping side of the disc 10, the outer portion thereof is turned back slightly as shown in Fig. 2 at 16. The portion of disc 10: surrounding the plate 12 is slightly concave, as at 17 to provide clearance for the bolt head and washer 12.

A circular rubber ange 18 has a concave face receiving the inner face of. disc 10 and is formed with a hub 19 through which passes the bolt I11, the flange 18 acting as a support and cushion for the disc 10. A washer 20 is provided on the bolt 11 adjacent the hub 19 while an elongated nut 21 is screwed on to the bolt 11 to hold the parts and assemble them properly. A shaft 22 is connected lixedly to the disc and is adapted to be received within the chuck provided on a portable electric motor whereby to impart rotary motion to the disc.

The turned back portion of the disc 10 has punched outwardly therein a plurality of raised perforations 23, substantially as illustrated and providing a scraping surface. It will be noted that in the drawing the perforations are provided in sets of eleven, the size of the perforations in each set decreasing towards the center of the disc, there being provided forty-two sets of such raised perforations. Each set of perforations curves slightly from the outer edge towards the center of the disc. The space provided between the adjacent rows of perforations 24 allows air to circulate during operation of the device to ICC keep the scraping disc cool while rotating in a clockwise direction. Fig. 3 shows a side sectional view of a perforation. It will be noted that the raised perforation provides a scraping edge which is self-sharpening in operation. The perforations are tapered inwardly away from the front face of the disc to prevent waste material from clogging up the openings.

ln operation the disc is attached to an electric motor and rotated in a clockwise direction. In removing paint or varnish, the disc is tilted and the large scraping surfaces on the outside of the disc scrape through the hard surface of the paint and varnish and clean it down to the wood. The smaller scrapers then smooth olf the wood. The disc is cooled by the passage of air between the surface being scraped and the lanes between the rows of raised perforations. Thus, air also passes through the perforations. The perforations are smaller' on the scraping side due to their taper preventing waste materials from collecting and clogging the openings.

While various changes may be made in the detail construction, it shall be understood that such changes shall be within the spirit and scope of the present invention as defined by the appended claims.

Having thus set forth and disclosed the nature of my invention, what is claimed is:

l. A scraping disc comprising a circular plate, means for mounting the center of said plate for powered rotary motion, said plate on the outer scraping portion thereof being turned back slightly, and rows of raised perforations on the scraping surface of said plate, the size of said perforations within each row decreasing from the outside of said disc toward the center thereof, each row of said perforations curving slightly from the outer edge toward the center of the disc, said plate being ro tated in a clockwise direction, said plate at the center thereof having a concave portion having a central opening, said means for mounting said plate for powered rotary motion comprising a bolt passing through said central opening with the head thereof received within said concave portion, a circular rubber flange on said bolt and abutting the rear face of said plate, a first washer on said bolt adjacent the bolt head, a second washer on said bolt adjacent the inner end of said flange, a lock nut securing said flange and plate together and a shaft connected to said assembly adapted to be received within the chuck of an electric motor.

2. A scraping disc according to claim l, said plate at the center thereof having a pair of radial slits intersecting each other at substantially right angles and terminating in enlarged openings.

3. A scraping disc according to claim 1, said raised perforations being tapered inwardly away from the front face of said plate.

4. A scraping disc according to claim 1, said disc being formed of sheet metal.

5. A scraping disc according to claim 1, said rubber flange including a concave face receiving the inner face of said disc and a hub integrally formed therewith through which passes said bolt, said flange acting as a support and cushion for said disc, said nut being elongated.

References Cited in the ile of this patent UNITED STATES PATENTS 760,095 Archdeacon May 17, 1904 943,046 Schleicher Dec. 14, 1909 943,102 Schleicher Dec. 14, 1909 1,387,027 Watrous Aug. 9, 1921 1,467,430 Hurd Sept. 11, 1923 1,576,645 Eskew et al. Mar. 16, 1926 1,829,531 Neilsen Oct. 27, 1931 

